21.47 miles per hour.
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100 meters/9 seconds = 40 kilometers per hour = 24.85 miles per hour (rounded)
402 meters in 4 minutes 47 seconds = 3.13 miles per hour.
(100 meters/16 seconds) x (3,600 seconds/hour) x (1 mile/1,609.344 meters) = 13.981 mph(rounded)
Speed = (distance)/(time) = exactly 100 meters per 11.2 seconds. In other, more familiar units: -- 32.143 kilometers per hour -- 19.97 miles per hour
400 meters in 43.18 seconds equates to an average speed of 20.72 miles per hour.